I want to preface this by saying that I think the democrats have no fucking idea how to do messaging and opposition.
But even if they did, we live in a system that wants their message to be ignored. Anything a politician says that is bad for business will not be televised. Or twisted to make them sound crazy. They have to oppose a regime that has nearly 100% of major media at least begrudgingly supporting if not enthusiastically.
I used to work in politics, it is next to impossible to get your message out if people with money don't want your message heard. The most important messaging is free media, as in the news and social media. Both of those have heavy corporate backing trying to control the narrative. Even the most progressive DSA politician has a hell of a time getting their real message through a controlled information stream.
The Dumbocrats are perpetual failures mixed in with some dino's but the media is a bigger issue, imo.
You'll have to expand on that thought because I don't know what you're getting at. People have been angry at the media long before trump, its trump that coopted it to get votes.